Improvement in moulds for casting- metals



have invented a certain new and useful Improvement `other words, the more rapidly the mould is revolved,

`hereinafter described, is intended to illustrate the apdiluted giant" cient yiilrc i HENRY navire, or oo vinieron, 'K-nN'rUcKY.

Letters ,Patent No. 98,673, dated January 11, 1870.

The Schedule referred to in these LettersPatent and making' peut of the` same.

To all whom` it may concern Be it known that I, HENRY DAvIns, of Goving` ton, in the county of Kenton, and State of Kentucky,

in the Art of Casting Metals; 4and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, .making part of this specification.

' The objects attained bylny invention, are- First/,- control of the quantity and quality of the chill imparted to chilled' rolls, and other cylindrical and circular bodies requiring to he chilled at their outer surfaces.

Second, by it I am enabled to obtain a more-clear and solid casting, by driving the slag-and dross to the centre, in whiclrcondition it will rise to the top, and may be 'taken olif if required. Y

Third, by it I am enabled to secure a true concentric hole in circular castings in which the core does not pass through the casting, as in casting hollow cannon, which is accomplished by revolving the mould in the same manner, but after the metal is poured in, when the superior centrifugal force of the metalwill drive the core to the centre. l

My mode of accomplishing these objects is by revolving Vthe mould upon its axis, and in a vertical position, when the circular motion of the mould will be communicated to the metal, and the centrifugal force thus created will cause the met-al to rise higher against the sides, leaving a hollow or basin in the centre, into which the slag or dross will be driven by the greater centrifuga-l force of the metal, and the height ofthe edge of the metal or depth of the basin fox med on its surface will be regulated by the speed at which the mould is revolved, and will, in this way, give a greater control over the part to be chilled. In

the higher the metal will be at the periphery, as compared with the centre, and the thinner will be the' edge against the chill, and the more quickly cooled, and, consequently, the harder will be the portion chilled, so thatthe thickness and hardness of the chill will 4be more completely under the control of the moulder, andmay be Varied as required by varying the rate of motion of the mould, together with the rapidity with which the metal is poured into it.

The mechanism shown in the annexed drawing, and

plication of my invention to the ca rolling iron.

Figure 1 is a perspective View of the chill and mould, accompanied Withthe requisite machinery for sustaining and revolving it. y

sting of rolls for Figure 2 is a vertical section ofthe same, in the Apit, and in theproper position for operation.

Figure 3 shows a ,modification Aof my invention,

hereinafterdescribed. l

As may be seen from the drawingsyg. 1, the mould is composed of three or more separate parts,

A" AA', drag, chill, and cope; the drag containing the mould of neck B' and wabbler C at the lower end of the chill, andV the cope A containing the neck B and wabbler C at the upper end of the chill, and joined together by screw-bolts and flanges at c c, or lugs, oriu any of the usual methods used in cast-ing chilled rolls. i

Fig. 2shows a pit in the ground or foundry-floor, on the bottom of which is appropriately placed the mechanism for sustaining and revolving the mould.

The said machinery/ consists of a vertical shaft, K, the lower end of which rests in an appropriate bearing, and its upper end is kept in a vertical position by suitable bearings, as shown.

. The top'of the .shaft K issnrmounted by the horizontal bevel-wheel F, face downward, and which is Vdriven by the pinion F', which receives its power through shaft M, from the pulley E.

E is a loose pulley on the same shaft, the functions 'of which it is not necessary to describe.

A socket, I), iig. 2, is formed in the top of shaft K, in which a ball, formed ou the bottom plate of the drag A of the mould rests. Said socket D is chambered out in the centre, as shown, to increase thefriction by which the mould is driven, and at' the same time to allow the wheels F, shafts K and M, and pulley E to be put into rapid motion before the inertia ofthe mould is overcome. In this-way, any shock to the mould by starting can be avoided.

H H H are friction-pulleys, placed at the top of the pit, or near the surface of the floor, and which, by their contact with the fiange of the cope A', or the upper iiange of the chill A, keep the mould in a vertical position.

I I are trunnions cast upon the centre-of the chill A, iu the usual manner, to raise and lower it into the pit. Y Fig. 3 is a vertical section of the cope A, having cylindrical space T, o1' sinking-head down to the top ofthe wabbler, or article to be cast, in the usual way, except that it may he smaller, and nearly parallel, in order to admitif a lcircular channel or space round the outside of sinking-head T, as shown.

From the bottom of said space is a series of holes or gates, V V, terminating on the end of the barrel ofthe roll. This modification of my invention is tor the purpose of enabling mc,when'chilled rolls are to be cast, to pour in 'hard metal in the circular channel,

and softermetal at the centre, or sinking-head. The former will be delivered near the periphery, while the 'mould is revolving, and will be kept to the sides of the chill by the centrifugal force, while the centre will be filled with softer metal.

It will be seen, that by varying the quantity and quality of the twometals, the depth and hardness of' the chill can be regulated without affecting the quality of the metal in the centre. Soft rolls, of course, ,will not require the chill; but two metals may be used in the saine manner if necessary.

In casting car-wheels by my improved method, it is only necessary to secure themould on the back of the wheel F,'or on a suitable horizontal face-plate upon Y when it will be thrown, by the centrifugal force, uniformly against the chill; -but before all the hard metal is poured, the softer metal should have been begun to ,be poured.

In this way a constant stream can be kept np, and a perfect union between the two metals will be secured.

Thus it will be seen that any degree 0i' hardness or thickness of chill on the tread vand 'flange can bey obtained, and at the same time have the body of the wheel oi' the toughest and strongest iron that can be had. It ismy yintention to apply for separate patents for the casting of cannon and car-wheels at an early day.

Having thus described my invention,

Whnyt- I claim as new, and desire to secure by Letters Patent, is-

A mould, having a .rotary motion given it, as described, when said mould is provided with concentric chambers, T and T', for pouring in two kinds of metal at the same time, as set forth.

HENRY DAVIES. Witnesses:

JAMES MOORE, WILLIAM Dai/Ins. 

